This is a note to let you know that I've just added the patch titled
kvm/powerpc/e500mc: fix tlb invalidation on cpu migration
to the 3.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kvm-powerpc-e500mc-fix-tlb-invalidation-on-cpu-migration.patch
and it can be found in the queue-3.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c5e6cb051c5f7d56f05bd6a4af22cb300a4ced79 Mon Sep 17 00:00:00 2001
From: Scott Wood <scottwood@xxxxxxxxxxxxx>
Date: Mon, 18 Feb 2013 18:13:09 +0000
Subject: kvm/powerpc/e500mc: fix tlb invalidation on cpu migration
From: Scott Wood <scottwood@xxxxxxxxxxxxx>
commit c5e6cb051c5f7d56f05bd6a4af22cb300a4ced79 upstream.
The existing check handles the case where we've migrated to a different
core than we last ran on, but it doesn't handle the case where we're
still on the same cpu we last ran on, but some other vcpu has run on
this cpu in the meantime.
Without this, guest segfaults (and other misbehavior) have been seen in
smp guests.
Signed-off-by: Scott Wood <scottwood@xxxxxxxxxxxxx>
Signed-off-by: Alexander Graf <agraf@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/kvm/e500mc.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
--- a/arch/powerpc/kvm/e500mc.c
+++ b/arch/powerpc/kvm/e500mc.c
@@ -108,6 +108,8 @@ void kvmppc_mmu_msr_notify(struct kvm_vc
{
}
+static DEFINE_PER_CPU(struct kvm_vcpu *, last_vcpu_on_cpu);
+
void kvmppc_core_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
struct kvmppc_vcpu_e500 *vcpu_e500 = to_e500(vcpu);
@@ -136,8 +138,11 @@ void kvmppc_core_vcpu_load(struct kvm_vc
mtspr(SPRN_GDEAR, vcpu->arch.shared->dar);
mtspr(SPRN_GESR, vcpu->arch.shared->esr);
- if (vcpu->arch.oldpir != mfspr(SPRN_PIR))
+ if (vcpu->arch.oldpir != mfspr(SPRN_PIR) ||
+ __get_cpu_var(last_vcpu_on_cpu) != vcpu) {
kvmppc_e500_tlbil_all(vcpu_e500);
+ __get_cpu_var(last_vcpu_on_cpu) = vcpu;
+ }
kvmppc_load_guest_fp(vcpu);
}
Patches currently in stable-queue which might be from scottwood@xxxxxxxxxxxxx are
queue-3.8/kvm-powerpc-e500mc-fix-tlb-invalidation-on-cpu-migration.patch
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